Built for the 1962 Seattle World's Fair, the United States Science Pavilion was designed by University of Washington alumnus Minoru Yamasaki, who would later become the architect of the World Trade Center in New York; it reopened as the Pacific Science Center on October 22, 1962, the day after the close of the fair. Today, the Science Center is composed of eight buildings, including two IMAX theaters, one of the world's largest Laser Dome theaters, a tropical butterfly house, a planetarium, and hundreds of hands-on science exhibits. A few of the original exhibits from the fair still remain, including a Lens and Mirror Machine and a suspended model of the Earth's moon.